Atoms, Molecules And Ions

Jagriti

Atoms, Molecules And Ions

10 May 2020

Introduction

Laws Of Chemical Combination And Dalton's Atomic Theory

Atom, Atomic Mass, Atoms Existence And Nomenclature Of Elements

Molecules and ions

Chemical Formula of compounds and rules for writing

Molecular Mass and Mole Concept

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Questions

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Introduction

1. The idea of divisibility of matter was considered long back in India, around 500 BC.

2. The unknown and unseen form of matter was always wondered by Ancient Indian and Greek philosophers.

3. Maharishi Kanad (Indian philosopher) : He postulated that if we go on dividing matter (padarth), we shall get smaller and smaller particles. Ultimately, a time will come when we shall come across the smallest particles beyond which further division will not be possible. He named these particles parmanu.

4. Pakudha Katyayama ( Indian philosopher) : he postulated that there are various forms of matter because the particles of matter exist together in combination.

5. Ancient Greek Philosophers – Democritus and Leucippus suggested that if we go on the dividing matter, a stage will come when particles obtained cannot be further divided.

6. All these ideas were based on philosophical consideration and not much experimental work.

7. The foundation of chemical science was laid by Antoine L. Lavoisier, by establishing two important laws of chemical combination.

Laws Of Chemical Combination And Dalton's Atomic Theory

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Atoms, Molecules And Ions

Atoms, Molecules And Ions

Questions

Introduction

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